Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true and openWorldHint=false, so the safety profile is covered. The description adds genuinely new context: result ordering (newest first), the fields returned, and the authentication requirement ('Requires an API key'). It omits pagination behavior despite a capped limit, which is the remaining gap.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

One compact sentence front-loads the resource and scope, with the return fields and auth requirement attached economically. No filler or redundancy.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a simple read-only list tool with no output schema and one optional param, the description covers what is returned, in what order, and that an API key is needed. The only meaningful omission is whether results are paginated or truncated at the limit.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The single 'limit' parameter has 0% schema description coverage, and the description never mentions it, its default of 50, or the 200 maximum. However, the schema does expose type, default, and min/max, making the parameter largely self-explanatory, so this lands at the minimum-viable level rather than a failure.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

Uses a specific verb (list) with a specific resource (images in this account) and even states the return fields and ordering (newest first, urls, size, prompt/description). The read/list nature cleanly separates it from siblings like create_image, add_image, and delete_image, though no sibling is named explicitly.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is only implied by the verb 'list' — an agent can infer this is the enumeration tool for images. There is no statement of when to prefer it over get_page_stats or get_account, and no exclusions or prerequisites beyond the API key note.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.